HTML DOM Interview Questions & Answers

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Are you looking for opportunities on HTML DOM? HTML DOM is the best platform and language independent interface that aids programs and scripts in dynamically accessing and updating the content, structure, and style of a document and is considered as a standard for this purpose. There are plenty openings as listed on wisdom jobs for different positions like Front-end developer, web developer, technical lead, coding analyst, and many as such. Apply for the various HTML DOM jobs from wisdomjobs.com portal before the opportunities actually get filled up. Clearing the interview further is no longer a hurdle if you could make your next step after applying for the jobs to HTML DOM jobs interview questions and answers page to get enough on the interview model.

JavaScript is just one of many programming languages with DOM support. What makes the combination of JavaScript and the DOM so exciting is the environment where they are used. Whereas most programming languages do all their work on the server side, putting together pages to be sent to the browser, JavaScript runs in the browser.

nodeName: is in the read only format and it is the parameter that acts like a tag name. It provides the information of attribute node and other nodes.nodeValue: is the way to specify the value of each individual node. The node value can be element wise or it can be text wise or other nodes value can be given.nodeType: provides a way to return the type of the node used and that is also in the read only format.

The Document Object Model (DOM) is an interface specification maintained by the W3C DOM Workgroup that defines an application independent mechanism to access, parse, or update XML data. In simple terms it is a hierarchical model that allows developers to manipulate XML documents easily Any developer that has worked extensively with XML should be able to discuss the concept and use of DOM objects freely. Additionally, it is not unreasonable to expect advanced candidates to thoroughly understand its internal workings and be able to explain how DOM differs from an event-based interface like SAX.

DOM parses an XML document and returns an instance of org.w3c.dom.Document. This document object's tree must then be "walked" in order to process the different elements. DOM parses the ENTIRE Document into memory, and then makes it available to you. The size of the Document you can parse is limited to the memory available.

Multi-tagging is a technique used by the DOM browser extension to identify a web page UI object. Whenever possible, DOM extension inserts more than one tag into the object identifier in following format:Browser.BrowserChild(page_title).html_class(caption_tag|window_tag)

Caption_tag is the caption of the HTML element.

#index_tag is the index of this HTML element, counting from the beginning of this page of the same class of HTML elements.

Using JavaScript we can made dynamic HTML content.We can use document.write() to show dynamic content on your web page.Below I have given you HTML page which made dynamic after using JavaScript.This example will show current date.Example:<html><body><script type="text/javascript">document.write(Date());</script></body></html>

The Document Object Model (DOM) is an interface specification maintained by the W3C DOM Workgroup that defines an application independent mechanism to access, parse, or update XML data. In simple terms it is a hierarchical model that allows developers to manipulate XML documents easily Any developer that has worked extensively with XML should be able to discuss the concept and use of DOM objects freely. Additionally, it is not unreasonable to expect advanced candidates to thoroughly understand its internal workings and be able to explain how DOM differs from an event-based interface like SAX.

Generally, Events are nothing other than actions. Using JavaScript we can noticed or triggered events.Example: When you use click on button than an event occur and function associated with button execute.We placed events within HTML tags. I have given you some events. Click through mouse, Click on advertisement in web page, When you select an input box in a HTML form, When you submit an HTML form.

Basically, the Document Object Model is a way of looking at a document. In that sense, it isn't all that different to CSS, which uses another kind of mental model. CSS uses the idea of selectors to interact with a document. The DOM, on the other hand, views a document as a tree of nodes: element nodes, attribute nodes and text nodes. The DOM provides a vocabulary for targeting and manipulating those nodes.If a programming language supports the DOM then you can use that same vocabulary to address any kind of markup document.

The DOM is a W3C (World Wide Web Consortium) standard.The DOM defines a standard for accessing documents like HTML and XML:"The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document."The DOM is separated into 3 different parts / levels:

Core DOM - standard model for any structured document

XML DOM - standard model for XML documents

HTML DOM - standard model for HTML documents

The DOM defines the objects and properties of all document elements, and the methods (interface) to access them.

A script code using them you can change the background color of elements of body.<html><body><script type="text/javascript">document.body.bgColor="pink";</script><p>Now, Your background color is pink.</p></body></html>

A script code using them you can change the text of an HTML element.Now, In example that I have shown below we change the text of the elementExample:<html><body><p id="welcome">R4R Welcomes You!</p><script type="text/javascript">document.getElementById("welcome").innerHTML="A new message from R4R";</script><p>R4R introduce a new service called VoiceBox using them you can chat with R4R.</p></body></html>

We changed the text of an element by using an function. In this example text has been changed when you execute function.Example:<html><head><script type="text/javascript">function ChangeText(){document.getElementById("welcome").innerHTML="R4R Welcomes You!";}</script></head><body><p id="welcome">Hello User!</p><input type="button" onclick="ChangeText()" value="When you click on button text will changed"></body></html>

You can change font and text of an element by using a function.Example:<html><head><script type="text/javascript">function ChangeText(){document.getElementById("welcome").style.color="red";document.getElementById("welcome").style.fontFamily="Times New Roman";document.getElementById("welcome").style.fontSize="20";}</script></head><body><p id="welcome">R4R Welcomes You!</p><input type="button" onclick="ChangeText()"value="When you click on button text font and color will change"></body></html>